EP0736337B1 - Classifying rotor for a centrifugal pneumatic separator - Google Patents

Classifying rotor for a centrifugal pneumatic separator Download PDF

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Publication number
EP0736337B1
EP0736337B1 EP95112071A EP95112071A EP0736337B1 EP 0736337 B1 EP0736337 B1 EP 0736337B1 EP 95112071 A EP95112071 A EP 95112071A EP 95112071 A EP95112071 A EP 95112071A EP 0736337 B1 EP0736337 B1 EP 0736337B1
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EP
European Patent Office
Prior art keywords
classifying wheel
wheel according
disc
classifying
pipe section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95112071A
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German (de)
French (fr)
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EP0736337A1 (en
Inventor
Georg Dipl. Ing. Konetzka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hosokawa Alpine AG
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Hosokawa Alpine AG
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Filing date
Publication date
Application filed by Hosokawa Alpine AG filed Critical Hosokawa Alpine AG
Publication of EP0736337A1 publication Critical patent/EP0736337A1/en
Application granted granted Critical
Publication of EP0736337B1 publication Critical patent/EP0736337B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes

Definitions

  • the invention relates to an air classifier with a against its centrifugal direction from the visible air from the outside rotating flow-through wheel with a ring shape arranged blades running parallel to the axis of rotation, the between a circular disc and the bearing wheel hub an annular cover plate are arranged. It affects a classifying wheel for such an air classifier that is made entirely a wear-resistant sintered material is produced.
  • a classifying wheel of the required type is for example the DE-PS 41 40 656 become known.
  • This classifying wheel the circular disc with hub, the cover disc and the between this arranged, extending parallel to the axis of rotation Buckets made in one piece.
  • the hole is in the hub with a semicircular in cross section trained groove for receiving a correspondingly shaped Feather key for torque transmission to a finished dimension for the immediate mounting of the sight wheel on his Machined drive shaft.
  • the flow channels between the Buckets are made by parallel to each other and in the direction of Axial surfaces of the blades formed in the Transition area to circular disk or cover disk by a Arc surface are interconnected. With this kind of Training can be relatively high Achieve manufacturing accuracy that balances the finished processed sight wheel makes unnecessary.
  • classifying wheel that is simple designed cylindrical ring elements is composed, the one another by a in joints between the ring elements introduced, solidifying filler are connected and processed to finished size before assembly and be balanced.
  • the main part of the classifying wheel is a piece of pipe, the Outside dimensions the main dimensions - diameter and height - of the sight wheel. In this pipe section are radial directed, evenly distributed over the circumference Flow channels incorporated, their boundary surfaces run parallel to each other and in the direction of the axis of rotation and at both ends by an arc surface with each other are connected so that classifying blades with themselves radially inside tapering cross section.
  • the axial distance an arc surface to the adjacent end face of the pipe section is at least equal to the thickness of the sight wheel hub bearing circular disc or the annular cover plate, the both are inserted into the pipe section so that their outside lying face and the corresponding face of the Pipe piece form a plane.
  • the axial position of the circular disc and cover plate can by a in the pipe section incorporated, ring-shaped stop surface or through Formation of the surfaces delimiting the soldering or adhesive joints be determined as conical surfaces. In a similar way the connection between the hub and the circular disc is carried out.
  • the advantage of the training shown is that critical areas of tension, especially in the transition area between circular disc and pipe section, eliminated or so far can be mitigated that the tensions occurring in the stay safe area and risk of breakage due to Cracking is eliminated.
  • a higher manufacturing accuracy, especially with classifying wheels with outside diameters over 250 mm, is achieved in that the individual parts as simple designed ring elements are formed that are inexpensive machined to finished dimensions before assembly and can be balanced.
  • the classifying wheel 1 consists of hub 2, circular disc 3, cover plate 4 and pipe section 5. All these parts are made a sintered material and are made before Assembling mechanically processed to finished dimensions (preferably ground) and balanced. Since it is simple ring elements are high Manufacturing accuracy achieved.
  • the pipe section 5 is on both Ends with offset to the center of rotation 6 Provide indentations for receiving circular disk 3 or cover plate 4 serve and a width corresponding to the Have thickness of the recorded disc, so that for the Sight wheel result in flat, stepless end faces on both sides.
  • the hub 2 the bore with a cross section semicircular feather keyway (9) is centered in inserted the circular disc 3, being offset by its Outer circumference is determined their axial position.
  • an adhesive is used, e.g. a Two-component adhesive that is in the joints 10, 11 and 12 at Joining the parts is filled.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Centrifugal Separators (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The sifting wheel (1) is made from simple design cylindrical ring elements (2,3,4,5) connected together by a filler which is introduced into the gaps (10,11,12) between the ring elements and then left to solidify. The ring elements are finished and balanced prior to adding the filler. The filler can be adhesive or solder metal. The width of the gaps between the ring elements is 0.1 mm max. Narrow distance strips inserted in the gaps evenly spread out round the circumference centre the ring element and ensure even gap width.

Description

Die Erfindung bezieht sich auf einen Windsichter mit einem entgegen seiner Schleuderrichtung von der Sichtluft von außen nach innen durchströmten, rotierenden Sichtrad mit kranzförmig angeordneten, parallel zur Drehachse verlaufenden Schaufeln, die zwischen einer die Sichtradnabe tragenden Kreisscheibe und einer ringförmigen Deckscheibe angeordnet sind. Sie betrifft ein Sichtrad für einen derartigen Windsichter, das ganz aus einem verschleißfesten Sinterwerkstoff hergestellt ist.The invention relates to an air classifier with a against its centrifugal direction from the visible air from the outside rotating flow-through wheel with a ring shape arranged blades running parallel to the axis of rotation, the between a circular disc and the bearing wheel hub an annular cover plate are arranged. It affects a classifying wheel for such an air classifier that is made entirely a wear-resistant sintered material is produced.

Ein Sichtrad der vorausgesetzten Art ist beispielsweise durch die DE-PS 41 40 656 bekannt geworden. Bei diesem Sichtrad sind die Kreisscheibe mit Nabe, die Deckscheibe und die zwischen diesen angeordneten, parallel zur Drehachse verlaufenden Schaufeln in einem Stück hergestellt. Dabei ist die Bohrung in der Nabe mit einer im Querschnitt halbkreisförmig ausgebildeten Nut zur Aufnahme einer entsprechend geformten Paßfeder für die Drehmomentenübertragung auf ein Fertigmaß für das unmittelbare Aufziehen des Sichtrades auf seine Antriebswelle bearbeitet. Die Strömungskanäle zwischen den Schaufeln werden durch parallel zueinander und in Richtung der Drehachse verlaufende Flächen der Schaufeln gebildet, die im Übergangsbereich zu Kreisscheibe bzw. Deckscheibe durch eine Bogenfläche miteinander verbunden sind. Mit dieser Art der Ausbildung läßt sich verhältnismäßig einfach eine hohe Fertigungsgenauigkeit erreichen, die ein Auswuchten des fertig bearbeiteten Sichtrades überflüssig macht.A classifying wheel of the required type is for example the DE-PS 41 40 656 become known. With this classifying wheel the circular disc with hub, the cover disc and the between this arranged, extending parallel to the axis of rotation Buckets made in one piece. The hole is in the hub with a semicircular in cross section trained groove for receiving a correspondingly shaped Feather key for torque transmission to a finished dimension for the immediate mounting of the sight wheel on his Machined drive shaft. The flow channels between the Buckets are made by parallel to each other and in the direction of Axial surfaces of the blades formed in the Transition area to circular disk or cover disk by a Arc surface are interconnected. With this kind of Training can be relatively high Achieve manufacturing accuracy that balances the finished processed sight wheel makes unnecessary.

Es hat sich jedoch gezeigt, daß diese Fertigungsgenauigkeit bei Sichträdern mit Außendurchmessern über 250 mm sowie bei einigen Sinterwerkstoffen nur mit einem hohen und damit unwirtschaftlichen Kostenaufwand zu ereichen ist. Außerdem ergab sich bei diesen Sichträdern eine unzureichende Bruchfestigkeit, wenn für ihre Herstellung bestimmte Sinterwerkstoffe, z. B. Aluminiumoxid-Keramik, verwendet wurden.However, it has been shown that this manufacturing accuracy for classifying wheels with outside diameters over 250 mm and for some sintered materials only with a high and therefore uneconomical costs can be achieved. Furthermore there was an inadequate one with these classifying wheels Breaking strength if intended for their manufacture Sintered materials, e.g. B. alumina ceramic used were.

Es ist die Aufgabe der Erfindung, ein Sichtrad mit den in der Beschreibungseinleitung genannten Merkmalen so auszubilden, daß es auch bei einem Außendurchmesser von mehr als 250 mm in kostengünstiger Weise mit hoher Fertigungsgenauigkeit herstellbar ist und daß es bei Verwendung aller handelsüblichen Sinterwerkstoffe die erforderliche Bruchfestigkeit besitzt.It is the object of the invention to use a classifying wheel in the Training the features mentioned in the introduction that it has an outer diameter of more than 250 mm cost-effective way with high manufacturing accuracy is producible and that it can be used with all commercially available sintered materials the required Has breaking strength.

Gelöst wird diese Aufgabe mit einem Sichtrad, das aus einfach gestalteten zylindrischen Ringelementen zusammengesetzt ist, die miteinander durch ein in Fugen zwischen den Ringelementen eingebrachtes, sich verfestigendes Füllmittel verbunden sind und die vor dem Zusammensetzen auf Fertigmaß bearbeitet und ausgewuchtet werden. Füllmittel kann ein Klebstoff oder ein Lötmetall bei einer Fugenbreite von maximal 0,1 mm sein. Hauptteil des Sichtrades ist ein Rohrstück, dessen Außenabmessungen die Hauptabmessungen - Durchmesser und Höhe - des Sichtrades bestimmen. In dieses Rohrstück sind radial gerichtete, gleichmäßig über den Umfang verteilte Strömungskanäle eingearbeitet, deren Begrenzungsflächen parallel zueinander und in Richtung der Drehachse verlaufen und an beiden Enden durch eine Bogenfläche miteinander verbunden sind, so daß Sichtradschaufeln mit sich radial nach innen verjüngendem Querschnitt entstehen. Der axiale Abstand einer Bogenfläche zur benachbarten Stirnfläche des Rohrstücks ist dabei mindestens gleich der Dicke der die Sichtradnabe tragenden Kreisscheibe bzw. der ringförmigen Deckscheibe, die beide so in das Rohrstück eingefügt sind, daß ihre außen liegende Stirnfläche und die entsprechende Stirnfläche des Rohrstücks eine Ebene bilden. Die axiale Lage von Kreisscheibe und Deckscheibe kann dabei durch eine in das Rohrstück eingearbeitete, ringförmige Anschlagfläche oder durch Ausbildung der die Löt- bzw. Klebefugen begrenzenden Flächen als Konusflächen bestimmt sein. In entsprechender Weise ist die Verbindung von Nabe und Kreisscheibe ausgeführt.This task is solved with a classifying wheel that is simple designed cylindrical ring elements is composed, the one another by a in joints between the ring elements introduced, solidifying filler are connected and processed to finished size before assembly and be balanced. Can be an adhesive or a filler Be solder with a joint width of maximum 0.1 mm. The main part of the classifying wheel is a piece of pipe, the Outside dimensions the main dimensions - diameter and height - of the sight wheel. In this pipe section are radial directed, evenly distributed over the circumference Flow channels incorporated, their boundary surfaces run parallel to each other and in the direction of the axis of rotation and at both ends by an arc surface with each other are connected so that classifying blades with themselves radially inside tapering cross section. The axial distance an arc surface to the adjacent end face of the pipe section is at least equal to the thickness of the sight wheel hub bearing circular disc or the annular cover plate, the both are inserted into the pipe section so that their outside lying face and the corresponding face of the Pipe piece form a plane. The axial position of the circular disc and cover plate can by a in the pipe section incorporated, ring-shaped stop surface or through Formation of the surfaces delimiting the soldering or adhesive joints be determined as conical surfaces. In a similar way the connection between the hub and the circular disc is carried out.

Es ist aber auch möglich, Rohrstück und Deckscheibe sowie Nabe und Kreisscheibe jeweils in einem Stück zu fertigen, so daß nur Rohrstück und Kreisscheibe in der beschriebenen Weise miteinander verbunden werden müssen.But it is also possible to have a piece of pipe and cover plate and hub and circular disk to be manufactured in one piece, so that only pipe section and circular disc in the manner described need to be connected.

Der Vorteil der dargestellten Ausbildung besteht darin, daß kritische Spannungsbereiche, vor allem im Übergangsbereich zwischen Kreisscheibe und Rohrstück, beseitigt oder so weit entschärft werden können, daß die auftretenden Spannungen im sicheren Bereich bleiben und die Bruchgefahr infolge von Rißbildung beseitigt ist. Eine höhere Fertigungsgenauigkeit, vor allem bei Sichträdern mit Außendurchmessern über 250 mm, wird dadurch erreicht, daß die Einzelteile als einfach gestaltete Ringelemente ausgebildet sind, die kostengünstig vor dem Zusammenfügen auf Fertigmaß bearbeitet und ausgewuchtet werden können.The advantage of the training shown is that critical areas of tension, especially in the transition area between circular disc and pipe section, eliminated or so far can be mitigated that the tensions occurring in the stay safe area and risk of breakage due to Cracking is eliminated. A higher manufacturing accuracy, especially with classifying wheels with outside diameters over 250 mm, is achieved in that the individual parts as simple designed ring elements are formed that are inexpensive machined to finished dimensions before assembly and can be balanced.

In der Zeichnung ist ein erfindungsgemäß ausgebildetes Sichtrad in zwei Ansichten und teilweise im Schnitt dargestellt. Das Sichtrad 1 besteht aus Nabe 2, Kreisscheibe 3, Deckscheibe 4 und Rohrstück 5. Alle diese Teile sind aus einem Sinterwerkstoff hergestellt und werden vor dem Zusammenfügen auf Fertigmaß mechanisch bearbeitet (vorzugsweise geschliffen) und ausgewuchtet. Da es sich dabei um einfach gestaltete Ringelemente handelt, wird eine hohe Fertigungsgenauigkeit erreicht. Das Rohrstück 5 ist an beiden Enden mit zur Drehachse 6 zentrischen, abgesetzten Eindrehungen versehen, die zur Aufnahme von Kreisscheibe 3 bzw. Deckscheibe 4 dienen und eine Breite entsprechend der Dicke der aufgenommenen Scheibe aufweisen, so daß sich für das Sichtrad beiderseits ebene, stufenlose Stirnflächen ergeben.In the drawing is a designed according to the invention Classification wheel in two views and partly in section shown. The classifying wheel 1 consists of hub 2, circular disc 3, cover plate 4 and pipe section 5. All these parts are made a sintered material and are made before Assembling mechanically processed to finished dimensions (preferably ground) and balanced. Since it is simple ring elements are high Manufacturing accuracy achieved. The pipe section 5 is on both Ends with offset to the center of rotation 6 Provide indentations for receiving circular disk 3 or cover plate 4 serve and a width corresponding to the Have thickness of the recorded disc, so that for the Sight wheel result in flat, stepless end faces on both sides.

Die Nabe 2, deren Bohrung mit einer im Querschnitt halbkreisförmigen Paßfedernut (9) versehen ist, ist zentrisch in die Kreisscheibe 3 eingefügt, wobei durch ihren abgesetzten Außenumfang ihre axiale Lage bestimmt wird. Für die Verbindung der Teile 2, 3, 4 und 5 wird ein Klebstoff verwendet, z.B. ein Zweikomponentenkleber, der in die Fugen 10, 11 und 12 beim Zusammenfügen der Teile eingefüllt wird.The hub 2, the bore with a cross section semicircular feather keyway (9) is centered in inserted the circular disc 3, being offset by its Outer circumference is determined their axial position. For the connection parts 2, 3, 4 and 5 an adhesive is used, e.g. a Two-component adhesive that is in the joints 10, 11 and 12 at Joining the parts is filled.

In das Rohrstück 5 sind radial gerichtete, gleichmäßig über den Umfang verteilte Strömungskanäle 7 eingearbeitet, deren Begrenzungswände parallel zueinander und in Richtung der Drehachse 6 verlaufen und an beiden Enden durch eine Bogenfläche miteinander verbunden sind, so daß Sichtradschaufeln 8 mit sich radial nach innen verjüngendem Querschnitt entstehen (Figur 2).In the pipe section 5 are radially directed, evenly over the circumference distributed flow channels 7 incorporated, the Boundary walls parallel to each other and in the direction of Rotation axis 6 run and at both ends by a Arc surface are connected so that Class wheel blades 8 with a radially inward tapering Cross section arise (Figure 2).

Claims (12)

  1. Classifying wheel (1) of a sintered material for an air classifier, whereby the classifying air flows contrary to the centrifugal direction, i.e. from the outside in, through vanes arranged in a ring parallel to the rotational axis (6) that are arranged between a circular disc (3) that bears the classifying wheel hub (2) and an annular-shaped cover disc (4), whereby the boring in the classifying wheel hub (2) has a semi-circular groove (9) to accommodate a matching feather key for torque transmission and whereby the flow channels (7) between the vanes (8) are formed by the planes of the vanes (8) that run parallel to each other in the direction of the rotational axis (6) and whereby these planes in the transition section to the circular disc (3) and cover disc (4) are connected with each other by means of an arch section, characterised in that the classifying wheel (1) consists of simple cylindrical ring elements (2, 3, 4, and 5) that are joined together by means of self-setting filler introduced into the gaps between the ring elements.
  2. Classifying wheel according to Claim 1, characterised in that the ring elements (2, 3, 4, and 5) are finished to size and balanced before assembly.
  3. Classifying wheel according to Claims 1 or 2, characterised in that the filler is an adhesive.
  4. Classifying wheel according to Claims 1 or 2, characterised in that the filler is a soldering metal.
  5. Classifying wheel according to one of the Claims 1 to 4, characterised in that the width of the gaps (10, 11, and 12) between the ring elements (2, 3, 4, and 5) is a maximum of 0,1 mm.
  6. Classifying wheel according to Claim 5, characterised in that narrow spacers are inserted in the gaps uniformly around the periphery to enable concentric adjustment of the ring elements (2, 3, 4, and 5) and to enable maintaining a constant gap width.
  7. Classifying wheel according to one of the Claims 1 to 6, characterised in that the classifying wheel hub (2), the circular disc (3), the cover disc (4), and the vane ring designed as a one-piece pipe section (5) with vanes (8) are the ring elements that form the classifying wheel (1).
  8. Classifying wheel according to Claim 7, characterised in that the circular disc (3) and cover disc (4) are inserted into the pipe section (5), whereby the outside end faces of the pipe section (5) and circular disc (3) or pipe section (5) and cover disc (4) are on one plane with each other in each case.
  9. Classifying wheel according to Claim 8, characterised in that annular stop faces are incorporated into the pipe section (5) to enable axial positioning of the circular disc (3) and cover disc (4).
  10. Classifying wheel according to Claim 8, characterised in that the planes that bound the gaps (10, 11, 12) formed by the circular disc(3) and pipe section (5) or cover disc (4) and pipe secti-on (5) are designed as conical planes.
  11. Classifying wheel according to one of the Claims 7 to 10, characterised in that the classifying wheel hub (2) and circular disc (3) are of one-piece manufacture.
  12. Classifying wheel according to one of the Claims 7 to 11, characterised in that the axial distance between an arch section joining the limiting planes of a flow channel (7) and a neighbouring front face of the pipe section (5) is at least as wide as the gauge of the circular disc (3) or cover disc (4).
EP95112071A 1995-04-07 1995-08-01 Classifying rotor for a centrifugal pneumatic separator Expired - Lifetime EP0736337B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29506015U DE29506015U1 (en) 1995-04-07 1995-04-07 Classification wheel for centrifugal wind classifiers
DE29506015U 1995-04-07

Publications (2)

Publication Number Publication Date
EP0736337A1 EP0736337A1 (en) 1996-10-09
EP0736337B1 true EP0736337B1 (en) 1999-09-29

Family

ID=8006578

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95112071A Expired - Lifetime EP0736337B1 (en) 1995-04-07 1995-08-01 Classifying rotor for a centrifugal pneumatic separator

Country Status (11)

Country Link
US (1) US5667075A (en)
EP (1) EP0736337B1 (en)
JP (1) JP4028901B2 (en)
KR (1) KR0185484B1 (en)
CN (1) CN1054552C (en)
AT (1) ATE185093T1 (en)
DE (2) DE29506015U1 (en)
DK (1) DK0736337T3 (en)
ES (1) ES2139124T3 (en)
MY (1) MY124295A (en)
TW (1) TW281639B (en)

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US6038987A (en) * 1999-01-11 2000-03-21 Pittsburgh Mineral And Environmental Technology, Inc. Method and apparatus for reducing the carbon content of combustion ash and related products
DE102004053530B4 (en) * 2004-11-05 2008-04-30 Aufbereitungstechnologie Noll Gmbh Classifying wheel for a device for separating dusty, fibrous or granular goods
CN104353613A (en) * 2014-11-04 2015-02-18 杭州能云科技有限公司 Laminar flow device for powder selecting machine
CN111871802B (en) * 2020-07-29 2023-06-20 海南大学 Continuous grading plant of soil deposit

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Also Published As

Publication number Publication date
TW281639B (en) 1996-07-21
MY124295A (en) 2006-06-30
EP0736337A1 (en) 1996-10-09
ES2139124T3 (en) 2000-02-01
JPH091078A (en) 1997-01-07
DE59506952D1 (en) 1999-11-04
KR0185484B1 (en) 1999-04-15
DE29506015U1 (en) 1995-06-14
US5667075A (en) 1997-09-16
KR960037140A (en) 1996-11-19
ATE185093T1 (en) 1999-10-15
JP4028901B2 (en) 2008-01-09
CN1054552C (en) 2000-07-19
CN1132667A (en) 1996-10-09
DK0736337T3 (en) 2000-04-03

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